"""add discovery metadata to worlds and create world_visits

Revision ID: 0003_add_discovery_metadata
Revises: 0002_add_date_of_birth_to_users
Create Date: 2025-01-02 00:00:00.000000

"""
from typing import Sequence, Union

from alembic import op
import sqlalchemy as sa
from sqlalchemy.dialects import postgresql

# revision identifiers, used by Alembic.
revision: str = "0003_add_discovery_metadata"
down_revision: Union[str, None] = "0002_add_date_of_birth_to_users"
branch_labels: Union[str, Sequence[str], None] = None
depends_on: Union[str, Sequence[str], None] = None


def upgrade() -> None:
    """Add discovery metadata columns to worlds and create world_visits."""
    # Add discovery metadata columns to worlds.
    op.add_column(
        "worlds",
        sa.Column("category", sa.String(length=100), nullable=True),
    )
    op.add_column(
        "worlds",
        sa.Column(
            "tags",
            postgresql.ARRAY(sa.String()),
            nullable=True,
            server_default="{}",
        ),
    )
    op.add_column(
        "worlds",
        sa.Column("play_count", sa.Integer(), nullable=False, server_default="0"),
    )
    op.add_column(
        "worlds",
        sa.Column("last_played_at", sa.DateTime(timezone=True), nullable=True),
    )

    # B-tree index on category, GIN index on tags.
    op.create_index(
        "ix_worlds_category",
        "worlds",
        ["category"],
        unique=False,
    )
    op.create_index(
        "ix_worlds_tags",
        "worlds",
        ["tags"],
        unique=False,
        postgresql_using="gin",
    )

    # Create world_visits table.
    op.create_table(
        "world_visits",
        sa.Column("id", sa.Integer(), primary_key=True),
        sa.Column("world_id", sa.Integer(), nullable=False),
        sa.Column("user_id", sa.Integer(), nullable=True),
        sa.Column("anonymous_token", sa.String(length=255), nullable=True),
        sa.Column(
            "visited_at",
            sa.DateTime(timezone=True),
            server_default=sa.func.now(),
        ),
        sa.ForeignKeyConstraint(
            ["world_id"], ["worlds.id"], ondelete="CASCADE"
        ),
        sa.ForeignKeyConstraint(
            ["user_id"], ["users.id"], ondelete="CASCADE"
        ),
    )
    op.create_index(
        op.f("ix_world_visits_id"), "world_visits", ["id"], unique=False
    )
    op.create_index(
        "ix_world_visits_world_id_visited_at",
        "world_visits",
        ["world_id", "visited_at"],
        unique=False,
    )


def downgrade() -> None:
    """Drop world_visits and discovery metadata columns from worlds."""
    op.drop_index(
        "ix_world_visits_world_id_visited_at", table_name="world_visits"
    )
    op.drop_index(op.f("ix_world_visits_id"), table_name="world_visits")
    op.drop_table("world_visits")

    op.drop_index("ix_worlds_tags", table_name="worlds")
    op.drop_index("ix_worlds_category", table_name="worlds")
    op.drop_column("worlds", "last_played_at")
    op.drop_column("worlds", "play_count")
    op.drop_column("worlds", "tags")
    op.drop_column("worlds", "category")